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Pt decorated POMOF-derived constructions for efficient electrocatalytic hydrogen evolution.

Wei Jia1, Juanli Zhang1, Zhenjiang Lu1

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We developed a novel platinum-copper decorated molybdenum carbide (Pt-Cu/Mo2C) nanostructure for efficient electrocatalytic hydrogen evolution. This catalyst shows superior performance and stability compared to traditional materials.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Molybdenum carbide (Mo2C) shows promise for catalysis due to its electronic structure similar to platinum-group metals.
  • Limitations in Mo2C application for electrocatalytic hydrogen evolution stem from low surface area and insufficient active sites.
  • Developing porous Mo2C-based nanostructures with controlled morphology is crucial.

Purpose of the Study:

  • To develop an efficient method for fabricating highly porous Mo2C-based nanostructures decorated with platinum-copper nanocrystals.
  • To evaluate the electrocatalytic performance of the novel Pt-Cu/Mo2C nanostructure for hydrogen evolution.
  • To assess the stability and durability of the developed catalyst.

Main Methods:

  • Synthesis of Mo2C octahedrons via thermal treatment of polyoxometalate (POM)-based metal-organic frameworks (NENU-5).
  • Decoration of Mo2C with Pt-Cu nanocrystals using galvanic replacement with H2PtCl6.
  • Electrocatalytic testing in an acidic medium for hydrogen evolution reaction (HER).

Main Results:

  • The Pt-Cu/Mo2C nanostructure achieved an ultrasmall overpotential of 12.9 mV at 10 mA cm-2 for hydrogen evolution.
  • Performance significantly surpassed bare Mo2C, Pt/Mo2C, and commercial Pt/C catalysts.
  • Exceptional cycling stability was demonstrated with negligible decay over 10,000 cycles.

Conclusions:

  • The developed Pt-Cu/Mo2C nanostructure is a highly efficient and durable catalyst for electrocatalytic hydrogen evolution.
  • The fabrication approach offers guidance for designing advanced catalysts.
  • This work advances the field of electrocatalysis for clean energy production.